A memory device including an array of memory cells, and a register circuit to store a value representative of a period of time to elapse before the memory device is ready to receive a command when recovering from a power down mode is provided in an embodiment. In the rotary electric machine, an outer-side outer diameter portion of an exhaust hole is formed on an inner diameter side of a position which is opposed to an axial-direction side end surface of a fan blade of a centrifugal fan in an axial direction. The pair of electrodes are configured to deliver energy, and one of the pair of electrodes are configured to be disposed in each electrode channel such that distal ends of each of the electrodes are arranged to protrude from the distal end of the shaft member. The method moreover envisages implementation of an algorithm for reconstruction and filtering of crossing signals, originated by the comparison of the vibration signals with one or more threshold values.